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US 9,519,235 B2Granted
Toner, developer using the toner, image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsShingo Sakashita, Shinya Nakayama, Masahide Yamada, Atsushi Yamamoto, Hideyuki Santo, Yukiko Nakajima, Suzuka Amemori
Life of this patent
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Abstract
A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.
Claims10
A toner, comprising:
- a binder resin comprising a crystalline resin, wherein the crystalline resin comprises a crystalline polyester resin and a urethane bond, a urea bond, or any combination thereof,
- wherein a tetrahydrofuran soluble content of the toner comprises 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and
- wherein the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.
A developer, comprising:
- a toner comprising a binder resin comprising a crystalline resin, wherein the crystalline resin comprises a crystalline polyester resin and a urethane bond, a urea bond, or any combination thereof,
- wherein a tetrahydrofuran soluble content of the toner comprises 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and
- wherein the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.
Dependencies are inferred from the claim text.